Containing the fiber loop inside, MPO loopback can realize the optical path in the same one connector, and transmit the optical signal from the transmitter to the receiver, to reach the optical signal receiving and transmitting circuit. In the signal loop formed by MPO loopback, various potential abnormalities can be located, so as to achieve the effective test and evaluation of the single component or interface duing the optical fiber network. MPO loopback produced by JFOPT has various choices of fiber type and fiber count, and is usually applied in 40G QSFP+ testing, troubleshooting and self-test of optical network equipment.
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